About 10 years ago I used a blue Pigma pen to sign a quilt. I didn't know I was supposed to iron it to set it.
I went over the line several times so it would really show. I washed the quilt WEEKS later and the !@#$%^&*()_ ink ran so now it looks all smeary there.
I'm not aware of any one else having an issue with Pigma pens, but I did with a blue one.